Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cf641df621374c…

MALICIOUS

PDF

84.0 KB Created: 2021-03-17 23:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0feec6b6061f515d84d7412350df9f95 SHA-1: 36c1b6fbe8a99de97fa7706032368c5f7ed51921 SHA-256: 09cf641df621374c001e113b6d9a413ae0cd9f5b5fc63fcf87e11b3fe5c7de16
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/123?utm_term=export+estimate+template+from+quickbooks PDF link annotation
    • https://balixilime.weebly.com/uploads/1/3/1/3/131398392/kemukuviluvin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_603a7ed7bdc0d.pdfIn PDF document text
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/12ef11013eb9.pdfIn PDF document text
    • http://apparentlyopt.com/41850322017j2cxl.pdfIn PDF document text
    • http://healsmall.space/space_wallpaper_hd7ozw3.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/ad82e039383.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/a342a3ac121a7b.pdfIn PDF document text
    • https://semowonobepak.weebly.com/uploads/1/3/4/2/134235862/pujuxowepati.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/replacing_battery_cateye_strada.pdfIn PDF document text
    • http://rewetuxavix.mypressonline.com/kiwenekoguvopuzuginom.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/ddebe48.pdfIn PDF document text
    • https://bemagage.weebly.com/uploads/1/3/4/5/134525224/2289208.pdfIn PDF document text
    • https://jamibada.weebly.com/uploads/1/3/1/1/131164428/nunimewaxam.pdfIn PDF document text
    • https://gamepasak.weebly.com/uploads/1/3/4/1/134109087/8863004.pdfIn PDF document text
    • https://sadupomojafex.weebly.com/uploads/1/3/0/7/130776775/1677368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_6042c28d35195.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_1a5757ee523a44d59e572f4108c71cfd.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_1d06a7084783444a88aef6bae3f16e9b.pdf?index=trueIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_ec76feb06924477a971b7dc48e2a954e.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_d9f6ab80fad04b838f326120cecdc3e4.pdf?index=trueIn PDF document text
    • http://pogetowem.onlinewebshop.net/how_to_reset_motorola_xt1921-2.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 5516 bytes
SHA-256: 53712d186c3764514f2e4126276108a5d1f17c929423ef25b3b6aa6762bfc403
font_01_sfnt_off00011d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D00 11048 bytes
SHA-256: 4e392b01b075cd6f4dc1815c7d0d2c0a41e46fbab65f1ec32fdeb041f6bdb38e